They can be identified by their most common feature of eleven arms although you might find them with more or less (7-14) depending upon circumstance. 3. Photo credit: wikipedia.com. The average lifespan of a sea star is 35 years. The average lifespan of a sea star is 35 years. They can be really heavy. The Eleven-armed Sea Star is the largest species of sea star in Sydney and is commonly seen at low-tide levels, either on the rocky shore or in sandy bays. Photo credit: wikipedia.com. With over 2,000 species of starfish, or Asteroida, living in the earth's marine waters, discovering a certain sea star's identity can be tricky. Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea.Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Help us grow with Givealittle we are. We stupidly thought that Eleven Armed Seastars would have 11 arms. But there's more to this seastar than just a confusing name. If you know the answer to this question, please register to join our limited beta program and start the conversation right now! Although the five-arm species is the most common, some sea stars have as many as 40 arms. It might actually be the oldest creature on the planet. Starfish use filtered sea water to pump nutrients through their nervous system. Females will feel plump and spongy when their arms are filled with eggs. Starfish with one or two large arms and three or four tiny new ones are known as sea comets. We stupidly thought that Eleven Armed Seastars would have 11 arms. Coscinasterias calamaria, or the eleven-armed sea star, is a starfish in the family Asteriidae.It was thought to be endemic to southern Australia and New Zealand but has since been documented as occurring in the Cape Peninsula as well. Unanswered Questions. Starfish with one or two large arms and three or four tiny new ones are known as sea comets. Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea.Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. About 1,500 species of starfish occur on the seabed in all the world's oceans, from the tropics to frigid polar waters. About 1,500 species of starfish occur on the seabed in all the world's oceans, from the tropics to frigid polar waters. The Eleven-armed Sea Star is native to Australia & New Zealand. 2. Its size is reflected by its name, the starfish is as big as a large biscuit. There are some 2,000 species of sea star living in all the world’s oceans, from tropical habitats to the cold seafloor. This means that some species can even regenerate an entirely new sea star from just one arm and a portion of the star's central disc. Sea stars commonly have 5 arms, but there are species with many more, including the New Zealand sea star that has 11 arms. What do 11-armed seastars eat? Their colour is normally blue (ocassionally brown), with accents of a multitude of colours. Nearly 2,000 species exist. It is found around low tide levels and deeper, under rocks and wandering over seaweed in pools. 4000 key depression per hour in Hindi mean. Starfish use filtered sea water to pump nutrients through their nervous system.